In order to meet the business needs of the group, Hitachi Metals officially changed its name to: Proterial.Ltd. in May 2023
The main products and business policy of the group remain unchanged, and the tool steel is, as always, developed and produced by the YSS factory in Japan


YSS Factory and Process characteristics
YSS Factory has a long history of more than 100 years. Through careful selection of various raw materials,
adhering to the traditional steel making technology, continuous innovation, and professional manufacturing of high-quality die steel.

ISOTROPY
Isotropy tool steels are so named because the difference in mechanical properties between its longitudinal
(forging or rolling direction) processed steels. This technological concept, which is highly evaluated by users of tool steels,
is applied for the production of all thesteels and contributes significantly to stabilizing their characteristics and enchance their service life